Retain a fixed number of containers when pruning

Time based container and image retention can have variable space
requirements depending on how often we deploy.

- Only prune stopped containers, retaining the 5 newest
- Then prune dangling images so we only keep images for the retained
containers.

lib/mrsk/cli/prune.rb

@@ -7,7 +7,7 @@ class Mrsk::Cli::Prune < Mrsk::Cli::Base
     end
   end
 
-  desc "images", "Prune unused images older than 7 days"
+  desc "images", "Prune dangling images"
   def images
     with_lock do
       on(MRSK.hosts) do
@@ -17,7 +17,7 @@ class Mrsk::Cli::Prune < Mrsk::Cli::Base
     end
   end
 
-  desc "containers", "Prune stopped containers older than 3 days"
+  desc "containers", "Prune all stopped containers, except the last 5"
   def containers
     with_lock do
       on(MRSK.hosts) do

lib/mrsk/commands/prune.rb

@@ -2,11 +2,19 @@ require "active_support/duration"
 require "active_support/core_ext/numeric/time"
 
 class Mrsk::Commands::Prune < Mrsk::Commands::Base
-  def images(until_hours: 7.days.in_hours.to_i)
-    docker :image, :prune, "--all", "--force", "--filter", "label=service=#{config.service}", "--filter", "until=#{until_hours}h"
+  def images
+    docker :image, :prune, "--all", "--force", "--filter", "label=service=#{config.service}", "--filter", "dangling=true"
   end
 
-  def containers(until_hours: 3.days.in_hours.to_i)
-    docker :container, :prune, "--force", "--filter", "label=service=#{config.service}", "--filter", "until=#{until_hours}h"
+  def containers(keep_last: 5)
+    pipe \
+      docker(:ps, "-q", "-a", "--filter", "label=service=#{config.service}", *stopped_containers_filters),
+      "tail -n +#{keep_last + 1}",
+      "while read container_id; do docker rm $container_id; done"
+  end
+
+  private
+    def stopped_containers_filters
+      [ "created", "exited", "dead" ].flat_map { |status| ["--filter", "status=#{status}"] }
     end
 end

test/cli/prune_test.rb

@@ -10,13 +10,13 @@ class CliPruneTest < CliTestCase
 
   test "images" do
     run_command("images").tap do |output|
-      assert_match /docker image prune --all --force --filter label=service=app --filter until=168h on 1.1.1.\d/, output
+      assert_match /docker image prune --all --force --filter label=service=app --filter dangling=true on 1.1.1.\d/, output
     end
   end
 
   test "containers" do
     run_command("containers").tap do |output|
-      assert_match /docker container prune --force --filter label=service=app --filter until=72h on 1.1.1.\d/, output
+      assert_match /docker ps -q -a --filter label=service=app --filter status=created --filter status=exited --filter status=dead | tail -n +6 | while read container_id; do docker rm $container_id; done on 1.1.1.\d/, output
     end
   end
 

test/commands/prune_test.rb

@@ -10,13 +10,13 @@ class CommandsPruneTest < ActiveSupport::TestCase
 
   test "images" do
     assert_equal \
-      "docker image prune --all --force --filter label=service=app --filter until=168h",
+      "docker image prune --all --force --filter label=service=app --filter dangling=true",
       new_command.images.join(" ")
   end
 
   test "containers" do
     assert_equal \
-      "docker container prune --force --filter label=service=app --filter until=72h",
+      "docker ps -q -a --filter label=service=app --filter status=created --filter status=exited --filter status=dead | tail -n +6 | while read container_id; do docker rm $container_id; done",
       new_command.containers.join(" ")
   end